javascript - How to invoke a function, whose name is passed in Json object?

I have a JSON object with a key element called callback.

{
"id":34,
"description":"",
"item_id":4,
"callback":"addNew",
"filename":"0000072.doc",
"type":"News",
"ext":"doc",
"size":46592
}

I would like to call the javascript "addNew" function. I tried.

json.callback(json);

But does not work. Any idea?

I have a JSON object with a key element called callback.

{
"id":34,
"description":"",
"item_id":4,
"callback":"addNew",
"filename":"0000072.doc",
"type":"News",
"ext":"doc",
"size":46592
}

I would like to call the javascript "addNew" function. I tried.

json.callback(json);

But does not work. Any idea?

Share Improve this question asked Jun 4, 2009 at 11:07 Sergio del Amo 78.1k68 gold badges153 silver badges180 bronze badges

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3 Answers 3

Sorted by: Reset to default 12

Assuming it is a global function (it shouldn't be):

window[json.callback](json);

If your code is well structured you will probably have an object containing all the functions the JSON could call.

var myObject = {
  func1: function myObject_func1_method(foo) {
    return 1;
  },
  func2: function myObject_func2_method(foo) {
    return 2;
  }
}

Then you can:

myObject[json.callback](json);

Don't use eval, use

window[json.callback](json);

If the function is in the global scope. Use the scope instead of window otherwise.

Use eval(json.callback+'()');